[英]How to show gridview footer which is bounded by table columns and table is empty ? ASP.NET C#
我正在研究我的SQL項目,我創建了一個gridview,其中我根據表列綁定了gridview頁腳中的值。
基本上,我正在創建一個gridview,其中用戶插入值並創建一個表。 但是,當表包含'One'記錄或多個記錄時,我正面臨一個問題,那么它工作正常,但我希望當表空,然后gridview的頁腳顯示包含“textboxes”,“checkboxes”和“dropdownlist” ”。
當表包含一個記錄然后這個gridview顯示,它工作正常,這里是
當表格中沒有數據時,此gridview顯示
我該如何顯示這種類型的gridview
當表沒有數據時,用戶插入值並創建表?
這是我的ASPX標記:
<asp:GridView ID="GridView1" runat="server" ShowHeaderWhenEmpty="True"
AutoGenerateColumns="False" BackColor="#DEBA84"
BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px" CellPadding="3" CellSpacing="2"
ShowFooter="True" Style="margin-left: 136px; margin-top: 72px;
margin-right: 0px;" Height="16px" Width="685px"
DataSourceID="sql">
<Columns>
<asp:TemplateField HeaderText="Column_Name" SortExpression="Column_Name">
<EditItemTemplate>
<asp:TextBox ID="txtName" runat="server" Text='<%# Bind("Column_Name") %>'></asp:TextBox>
<asp:RequiredFieldValidator Text="*" ID="colname" ControlToValidate="txtName"
runat="server" ErrorMessage="Column Name is Required" ForeColor="Red">
</asp:RequiredFieldValidator>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Column_Name") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtColName" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ValidationGroup="INSERT" Text="*" ID="insertcolname" ControlToValidate="txtColName"
runat="server" ErrorMessage="Column Name is Required" ForeColor="Red">
</asp:RequiredFieldValidator>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Data_Type" SortExpression="Data_Type">
<EditItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" SelectedValue='<%# Bind("Data_Type") %>'>
<asp:ListItem>Select Datatype</asp:ListItem>
<asp:ListItem>int</asp:ListItem>
<asp:ListItem>Float</asp:ListItem>
<asp:ListItem>Varchar(50)</asp:ListItem>
<asp:ListItem>Varchar(100)</asp:ListItem>
<asp:ListItem>double</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="datatype" ControlToValidate="DropDownList1"
runat="server" ErrorMessage="Data Type is Required" ForeColor="Red" InitialValue="Select Datatype">
</asp:RequiredFieldValidator>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("Data_Type") %>'></asp:Label>
</ItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="DropDownList2" runat="server">
<asp:ListItem>Select Datatype</asp:ListItem>
<asp:ListItem>int</asp:ListItem>
<asp:ListItem>Float</asp:ListItem>
<asp:ListItem>Varchar(50)</asp:ListItem>
<asp:ListItem>Varchar(100)</asp:ListItem>
<asp:ListItem>double</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ValidationGroup="INSERT" Text="*" ID="datatype" ControlToValidate="DropDownList2"
runat="server" ErrorMessage="Data Type is Required" ForeColor="Red" InitialValue="Select Datatype">
</asp:RequiredFieldValidator>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Allow_Null_" SortExpression="Allow_Null_">
<EditItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" Checked='<%#Convert.ToBoolean(DataBinder.Eval(Container.DataItem,"Allow_Null_")) %>'/>
</EditItemTemplate>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# Convert.ToBoolean(DataBinder.Eval(Container.DataItem,"Allow_Null_"))%>' enabled="false" />
</ItemTemplate>
<FooterTemplate>
<asp:CheckBox ID="nulll" runat="server" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Primary_Key_" SortExpression="Primary_Key_">
<EditItemTemplate>
<asp:CheckBox ID="CheckBox2" runat="server" Checked='<%# Convert.ToBoolean(DataBinder.Eval(Container.DataItem,"Primary_Key_")) %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:CheckBox ID="CheckBox2" runat="server"
Checked='<%#Convert.ToBoolean(DataBinder.Eval(Container.DataItem,"Primary_Key_")) %>' Enabled="false" />
</ItemTemplate>
<FooterTemplate>
<asp:CheckBox ID="primary" runat="server" />
</FooterTemplate>
</asp:TemplateField>
<asp:CommandField ShowEditButton="True" />
<asp:CommandField ShowDeleteButton="True" />
<asp:TemplateField HeaderText="Insert">
<FooterTemplate>
<asp:LinkButton ValidationGroup="INSERT" ID="LinkButton1" runat="server" OnClick="lbinssert">INSERT</asp:LinkButton>
</FooterTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
<HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />
<PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
<RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
<SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />
<SortedAscendingCellStyle BackColor="#FFF1D4" />
<SortedAscendingHeaderStyle BackColor="#B95C30" />
<SortedDescendingCellStyle BackColor="#F1E5CE" />
<SortedDescendingHeaderStyle BackColor="#93451F" />
</asp:GridView>
<asp:ValidationSummary ValidationGroup="INSERT" ID="ValidationSummary1" ForeColor="Red"
runat="server" Height="25px" style="margin-left: 140px" />
<br />
<input type="submit" style="position:relative; width:30px; left:452px; top: 0px; width: 86px;"
value="Create table" name="create"/>
<asp:ValidationSummary ID="ValidationSummary2" ForeColor="Red" runat="server"
style="margin-left: 142px" />
<asp:SqlDataSource ID="sql" runat="server"
ConnectionString="<%$ ConnectionStrings:db_compilerConnectionString %>"
SelectCommand="SELECT [Column_Name], [Data_Type], [Allow_Null_], [Primary_Key_], [Date] FROM [tbl_field]"
DeleteCommand="DELETE FROM [tbl_field] WHERE [Field_id]=@field" InsertCommand="INSERT INTO [tbl_field] ([Column_Name],[Data_Type],[Database_id],[Allow_Null_],[Primary_Key_])Values (@ColumnName,@Dtype,@id,@null,@primary)"
UpdateCommand="UPDATE [tbl_field] SET [Column_Name]=@ColumnName,[Data_Type]=@Dtype,[Database_id]=@id,[Allow_Null_]=@null,[Primary_Key_]=@primary">
<DeleteParameters>
<asp:Parameter Name="field" Type="Int32" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="ColumnName" Type="String" />
<asp:Parameter Name="Dtype" Type="String" />
<asp:Parameter Name="id" Type="String" />
<asp:Parameter Name="null" Type="Boolean" />
<asp:Parameter Name="primary" Type="Boolean" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="ColumnName" Type="String" />
<asp:Parameter Name="Dtype" Type="String" />
<asp:Parameter Name="id" Type="String" />
<asp:Parameter Name="null" Type="Boolean"/>
<asp:Parameter Name="primary" Type="Boolean" />
</UpdateParameters>
</asp:SqlDataSource>
這是我的aspx.cs代碼:
public void lbinssert(Object sender,EventArgs e)
{
sql.InsertParameters["ColumnName"].DefaultValue =
((TextBox)GridView1.FooterRow.FindControl("txtColName")).Text;
sql.InsertParameters["Dtype"].DefaultValue =
((DropDownList)GridView1.FooterRow.FindControl("DropDownList2")).Text;
sql.InsertParameters["id"].DefaultValue =
((DropDownList)GridView1.FooterRow.FindControl("DropDownList2")).Text;
sql.InsertParameters["null"].DefaultValue =
((CheckBox)GridView1.FooterRow.FindControl("nulll")).Checked == true ? "true" : "false";
sql.InsertParameters["primary"].DefaultValue = ((CheckBox)GridView1.FooterRow.FindControl("primary")).Checked == true ? "true" : "false";
sql.Insert();
}
我建議以下解決方案:
考慮到您返回的數據表將通過測試它包含零記錄dataTable.Rows.Count == 0
。
當上面的dataTable返回零記錄時,然后運行以下代碼:
if(dataTable.Rows.Count == 0)
{
FixGridFooter(dataTable);
}
else
{
GridView1.DataSource = datatable;
GridView1.DataBind();
}
該方法將虛擬記錄添加到數據表,然后綁定到Gridview並顯示在頁腳中。
private void FixGridFooter(DataTable dataSource)
{
//add blank row to the the resultset
dataSource.Rows.Add(dataSource.NewRow());
dataSource.Rows[0]["Value1"] = 0;
dataSource.Rows[0]["Value2"] = "";
dataSource.Rows[0]["RecordDate"] = DateTime.Now.ToString("dd MMM yyyy");
dataSource.Rows[0]["Checked"] = false;
GridView1.DataSource = dataSource;
GridView1.DataBind();
//hide empty row - if you want to display it on an event like a button click else it will display as per default.
GridView1.Rows[0].Visible = false;
}
然后,通過<asp:TemplateField>
的FooterTemplate
插入新記錄。
當你有事件或在加載事件中,你可以調用GridView1.ShowFooter = true;
。 當數據表最終返回記錄時, ShowFooter
可以再次設置為不可見。
這是一個非常快速和骯臟的解決方案。 顯然可以做很多優化,但我會離開而不是你。
在頁腳tamplte中將是一個帶有CommandName="Insert"
的按鈕插入。 在RowCommand事件中,您將測試命令名稱,然后從行中檢索值以進行插入
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
try
{
if (e.CommandName.Equals("Insert")
{
//insert code
var returnString = GridView1.FooterRow.FindControl("txtValue") as TextBox;
GridView1.ShowFooter = false;
}
}
Update
和Delete
您可以通過設計器屬性中的標准GridView
設置添加並相應地添加功能。
當Gridview
為空時,您必須插入虛擬行。
這是有用的鏈接。
和
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